Hundreds of thousands of passengers on the bay area's commuter trains may have been exposed to measles a student at UC Berkeley was diagnosed with the disease -- the taking -- home to. A suburb for several days -- the student contracted the measles while traveling overseas and had not been vaccinated the virus can stay in the air Brooks two hours. Early on it's very much like any any any common cold -- people can get a pretty high fever. -- and start getting getting cough. And runny nose and very real life and the president of the initial symptoms that occur the key thing about these movies -- which is classic and not always. And in some individuals comes later.

This transcript has been automatically generated and may not be 100% accurate.

{"id":22520414,"title":"San Francisco Subway Riders Warned of Measles Risk","duration":"3:00","description":"UC Berkeley student may have exposed thousands to the disease before his diagnosis.","section":"Health","mediaType":"Default"}